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        </div><article class="page single"><h1 class="single-title animated flipInX">Spring源码 - ConfigurationClassPostProcessor源码解析</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="https://wlizhi.cc" title="Author" target="_blank" rel="noopener noreffer author" class="author"><i class="fas fa-user-circle fa-fw"></i>Wlizhi</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/spring/"><i class="far fa-folder fa-fw"></i>spring</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2020-11-29">2020-11-29</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 3766 字&nbsp;
                <i class="far fa-clock fa-fw"></i>&nbsp;预计阅读 8 分钟&nbsp;<span id="/posts/spring/08-configuration-class-post-processor/" class="leancloud_visitors" data-flag-title="Spring源码 - ConfigurationClassPostProcessor源码解析">
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  <ul>
    <li><a href="#1-主流程">1 主流程</a></li>
    <li><a href="#2-循环所有benaname校验bean是否符合">2 循环所有benaName、校验bean是否符合</a></li>
    <li><a href="#3-解析">3 解析</a></li>
    <li><a href="#4-装载beandefinition">4 装载BeanDefinition</a></li>
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            </div><div class="content" id="content"><p>spring源码系列文章，示例代码的中文注释，均是 copy 自 <a href="https://gitee.com/wlizhi/spring-framework" target="_blank" rel="noopener noreffer">https://gitee.com/wlizhi/spring-framework</a> 。</p>
<p>链接中源码是作者从 github 下载，并以自身理解对核心流程及主要节点做了详细的中文注释。</p>
<hr>
<h2 id="1-主流程">1 主流程</h2>
<p>在调用 invokeBeanDefinitionRegistryPostProcessors() 是，会调用到这个实现类中，来到源码：
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">ConfigurationClassPostProcessor</span> <span class="kd">implements</span> <span class="n">BeanDefinitionRegistryPostProcessor</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">		<span class="n">PriorityOrdered</span><span class="o">,</span> <span class="n">ResourceLoaderAware</span><span class="o">,</span> <span class="n">BeanClassLoaderAware</span><span class="o">,</span> <span class="n">EnvironmentAware</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">public</span> <span class="kt">void</span> <span class="nf">processConfigBeanDefinitions</span><span class="o">(</span><span class="n">BeanDefinitionRegistry</span> <span class="n">registry</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">List</span><span class="o">&lt;</span><span class="n">BeanDefinitionHolder</span><span class="o">&gt;</span> <span class="n">configCandidates</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 获取到所有的BeanDefinitionNames
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">String</span><span class="o">[]</span> <span class="n">candidateNames</span> <span class="o">=</span> <span class="n">registry</span><span class="o">.</span><span class="na">getBeanDefinitionNames</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 循环调用
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">beanName</span> <span class="o">:</span> <span class="n">candidateNames</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">BeanDefinition</span> <span class="n">beanDef</span> <span class="o">=</span> <span class="n">registry</span><span class="o">.</span><span class="na">getBeanDefinition</span><span class="o">(</span><span class="n">beanName</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 省略无关代码...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">//检查给定的bean定义是否适合配置类（或在配置/组件类中声明的嵌套组件类，也要自动注册），并进行相应标记。
</span></span></span><span class="line hl"><span class="cl"><span class="c1"></span>			<span class="k">if</span> <span class="o">(</span><span class="n">ConfigurationClassUtils</span><span class="o">.</span><span class="na">checkConfigurationClassCandidate</span><span class="o">(</span><span class="n">beanDef</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">metadataReaderFactory</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">configCandidates</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="k">new</span> <span class="n">BeanDefinitionHolder</span><span class="o">(</span><span class="n">beanDef</span><span class="o">,</span> <span class="n">beanName</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 省略无关代码...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Parse each @Configuration class
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">ConfigurationClassParser</span> <span class="n">parser</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ConfigurationClassParser</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">				<span class="k">this</span><span class="o">.</span><span class="na">metadataReaderFactory</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">problemReporter</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">environment</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">				<span class="k">this</span><span class="o">.</span><span class="na">resourceLoader</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">componentScanBeanNameGenerator</span><span class="o">,</span> <span class="n">registry</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">Set</span><span class="o">&lt;</span><span class="n">BeanDefinitionHolder</span><span class="o">&gt;</span> <span class="n">candidates</span> <span class="o">=</span> <span class="k">new</span> <span class="n">LinkedHashSet</span><span class="o">&lt;&gt;(</span><span class="n">configCandidates</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">Set</span><span class="o">&lt;</span><span class="n">ConfigurationClass</span><span class="o">&gt;</span> <span class="n">alreadyParsed</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HashSet</span><span class="o">&lt;&gt;(</span><span class="n">configCandidates</span><span class="o">.</span><span class="na">size</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="k">do</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// TODO 重要程度：5 ConfigurationClassParser的parse方法调用，这里解析了一系列的注解
</span></span></span><span class="line hl"><span class="cl"><span class="c1"></span>			<span class="n">parser</span><span class="o">.</span><span class="na">parse</span><span class="o">(</span><span class="n">candidates</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">parser</span><span class="o">.</span><span class="na">validate</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">			<span class="n">Set</span><span class="o">&lt;</span><span class="n">ConfigurationClass</span><span class="o">&gt;</span> <span class="n">configClasses</span> <span class="o">=</span> <span class="k">new</span> <span class="n">LinkedHashSet</span><span class="o">&lt;&gt;(</span><span class="n">parser</span><span class="o">.</span><span class="na">getConfigurationClasses</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">			<span class="n">configClasses</span><span class="o">.</span><span class="na">removeAll</span><span class="o">(</span><span class="n">alreadyParsed</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// Read the model and create bean definitions based on its content
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">reader</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">this</span><span class="o">.</span><span class="na">reader</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ConfigurationClassBeanDefinitionReader</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">						<span class="n">registry</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">sourceExtractor</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">resourceLoader</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">environment</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">						<span class="k">this</span><span class="o">.</span><span class="na">importBeanNameGenerator</span><span class="o">,</span> <span class="n">parser</span><span class="o">.</span><span class="na">getImportRegistry</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 这里装载了BeanDefinition
</span></span></span><span class="line hl"><span class="cl"><span class="c1"></span>			<span class="k">this</span><span class="o">.</span><span class="na">reader</span><span class="o">.</span><span class="na">loadBeanDefinitions</span><span class="o">(</span><span class="n">configClasses</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 省略无关代码...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">while</span> <span class="o">(!</span><span class="n">candidates</span><span class="o">.</span><span class="na">isEmpty</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 省略无关代码...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span></span></span></code></pre></td></tr></table>
</div>
</div>
划重点（上面源码中的高亮部分）：</p>
<ol>
<li>校验是否符合条件，完成对@Configuration、@Component、@ComponentScan、@Import、@ImportResource、方法上包含@Bean 的支持。</li>
<li>执行 parse()，完成解析。</li>
<li>loadBeanDefinitions()，装载 BeanDefinition。</li>
</ol>
<h2 id="2-循环所有benaname校验bean是否符合">2 循环所有benaName、校验bean是否符合</h2>
<p><span id="checkConfigurationClassCandidate-source"></span>
进入 checkConfigurationClassCandidate() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">ConfigurationClassUtils</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">public</span> <span class="kd">static</span> <span class="kt">boolean</span> <span class="nf">checkConfigurationClassCandidate</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">			<span class="n">BeanDefinition</span> <span class="n">beanDef</span><span class="o">,</span> <span class="n">MetadataReaderFactory</span> <span class="n">metadataReaderFactory</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 省略无关代码...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// 类上是否包含@Configuration
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">isFullConfigurationCandidate</span><span class="o">(</span><span class="n">metadata</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">beanDef</span><span class="o">.</span><span class="na">setAttribute</span><span class="o">(</span><span class="n">CONFIGURATION_CLASS_ATTRIBUTE</span><span class="o">,</span> <span class="n">CONFIGURATION_CLASS_FULL</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 类上是包含@Component、@ComponentScan、@Import、@ImportResource。方法上包含@Bean
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="n">isLiteConfigurationCandidate</span><span class="o">(</span><span class="n">metadata</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">beanDef</span><span class="o">.</span><span class="na">setAttribute</span><span class="o">(</span><span class="n">CONFIGURATION_CLASS_ATTRIBUTE</span><span class="o">,</span> <span class="n">CONFIGURATION_CLASS_LITE</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="kc">false</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 省略无关代码
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">return</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>isFullConfigurationCandidate() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">ConfigurationClassUtils</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">public</span> <span class="kd">static</span> <span class="kt">boolean</span> <span class="nf">isFullConfigurationCandidate</span><span class="o">(</span><span class="n">AnnotationMetadata</span> <span class="n">metadata</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">metadata</span><span class="o">.</span><span class="na">isAnnotated</span><span class="o">(</span><span class="n">Configuration</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>isLiteConfigurationCandidate() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">ConfigurationClassUtils</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="c1">// 注意这个成员变量，包含了对一些内置注解的支持。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>   	<span class="kd">private</span> <span class="kd">static</span> <span class="kd">final</span> <span class="n">Set</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span> <span class="n">candidateIndicators</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HashSet</span><span class="o">&lt;&gt;(</span><span class="n">8</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">   
</span></span><span class="line"><span class="cl">   	<span class="kd">static</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">   		<span class="c1">// 添加了一系列注解的支持。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>   		<span class="n">candidateIndicators</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">Component</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">   		<span class="n">candidateIndicators</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">ComponentScan</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">   		<span class="n">candidateIndicators</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">Import</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">   		<span class="n">candidateIndicators</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">ImportResource</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">   	<span class="o">}</span>
</span></span><span class="line"><span class="cl">    <span class="kd">public</span> <span class="kd">static</span> <span class="kt">boolean</span> <span class="nf">isLiteConfigurationCandidate</span><span class="o">(</span><span class="n">AnnotationMetadata</span> <span class="n">metadata</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 类上是包含@Component、@ComponentScan、@Import、@ImportResource。方法上包含@Bean
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">indicator</span> <span class="o">:</span> <span class="n">candidateIndicators</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">metadata</span><span class="o">.</span><span class="na">isAnnotated</span><span class="o">(</span><span class="n">indicator</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">return</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// @Bean的支持
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">return</span> <span class="n">metadata</span><span class="o">.</span><span class="na">hasAnnotatedMethods</span><span class="o">(</span><span class="n">Bean</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="3-解析">3 解析</h2>
<p>来到 parse() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">class</span> <span class="nc">ConfigurationClassParser</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">parse</span><span class="o">(</span><span class="n">Set</span><span class="o">&lt;</span><span class="n">BeanDefinitionHolder</span><span class="o">&gt;</span> <span class="n">configCandidates</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">BeanDefinitionHolder</span> <span class="n">holder</span> <span class="o">:</span> <span class="n">configCandidates</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">BeanDefinition</span> <span class="n">bd</span> <span class="o">=</span> <span class="n">holder</span><span class="o">.</span><span class="na">getBeanDefinition</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">			<span class="c1">//这是哪个分支的解析会走到同一个方法里
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>            <span class="k">if</span> <span class="o">(</span><span class="n">bd</span> <span class="k">instanceof</span> <span class="n">AnnotatedBeanDefinition</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                <span class="c1">//执行解析
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                <span class="n">parse</span><span class="o">(((</span><span class="n">AnnotatedBeanDefinition</span><span class="o">)</span> <span class="n">bd</span><span class="o">).</span><span class="na">getMetadata</span><span class="o">(),</span> <span class="n">holder</span><span class="o">.</span><span class="na">getBeanName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">            <span class="o">}</span>
</span></span><span class="line"><span class="cl">            <span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="n">bd</span> <span class="k">instanceof</span> <span class="n">AbstractBeanDefinition</span> <span class="o">&amp;&amp;</span> <span class="o">((</span><span class="n">AbstractBeanDefinition</span><span class="o">)</span> <span class="n">bd</span><span class="o">).</span><span class="na">hasBeanClass</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                <span class="c1">//执行解析
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                <span class="n">parse</span><span class="o">(((</span><span class="n">AbstractBeanDefinition</span><span class="o">)</span> <span class="n">bd</span><span class="o">).</span><span class="na">getBeanClass</span><span class="o">(),</span> <span class="n">holder</span><span class="o">.</span><span class="na">getBeanName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">            <span class="o">}</span>
</span></span><span class="line"><span class="cl">            <span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                <span class="c1">// TODO 执行解析，记着这个方法，这里在满足条件时会被递归调用。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                <span class="n">parse</span><span class="o">(</span><span class="n">bd</span><span class="o">.</span><span class="na">getBeanClassName</span><span class="o">(),</span> <span class="n">holder</span><span class="o">.</span><span class="na">getBeanName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">            <span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">deferredImportSelectorHandler</span><span class="o">.</span><span class="na">process</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>对不同类型的 BeanDefinition 会调用不同的重载 parse()，实际上，最终都会进到这个方法：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">class</span> <span class="nc">ConfigurationClassParser</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="kt">void</span> <span class="nf">processConfigurationClass</span><span class="o">(</span><span class="n">ConfigurationClass</span> <span class="n">configClass</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">IOException</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 省略无关代码...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Recursively process the configuration class and its superclass hierarchy.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">SourceClass</span> <span class="n">sourceClass</span> <span class="o">=</span> <span class="n">asSourceClass</span><span class="o">(</span><span class="n">configClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">do</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 执行解析
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">sourceClass</span> <span class="o">=</span> <span class="n">doProcessConfigurationClass</span><span class="o">(</span><span class="n">configClass</span><span class="o">,</span> <span class="n">sourceClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">while</span> <span class="o">(</span><span class="n">sourceClass</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 这里将配置类的信息放入缓存中，等解析完之后，会将配置类进行LoadBeanDefinitions();
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">this</span><span class="o">.</span><span class="na">configurationClasses</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">configClass</span><span class="o">,</span> <span class="n">configClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>是在一个循环中调用的，如果返回不为空，就一直执行。每次会更新sourceClass的值。</p>
<p>进入 doProcessConfigurationClass()：
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">class</span> <span class="nc">ConfigurationClassParser</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">protected</span> <span class="kd">final</span> <span class="n">SourceClass</span> <span class="nf">doProcessConfigurationClass</span><span class="o">(</span><span class="n">ConfigurationClass</span> <span class="n">configClass</span><span class="o">,</span> <span class="n">SourceClass</span> <span class="n">sourceClass</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">			<span class="kd">throws</span> <span class="n">IOException</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// Component注解支持
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">configClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">().</span><span class="na">isAnnotated</span><span class="o">(</span><span class="n">Component</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">()))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// Recursively process any member (nested) classes first
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">processMemberClasses</span><span class="o">(</span><span class="n">configClass</span><span class="o">,</span> <span class="n">sourceClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// Process any @PropertySource annotations
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">for</span> <span class="o">(</span><span class="n">AnnotationAttributes</span> <span class="n">propertySource</span> <span class="o">:</span> <span class="n">AnnotationConfigUtils</span><span class="o">.</span><span class="na">attributesForRepeatable</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">				<span class="n">sourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">(),</span> <span class="n">PropertySources</span><span class="o">.</span><span class="na">class</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">				<span class="n">org</span><span class="o">.</span><span class="na">springframework</span><span class="o">.</span><span class="na">context</span><span class="o">.</span><span class="na">annotation</span><span class="o">.</span><span class="na">PropertySource</span><span class="o">.</span><span class="na">class</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">environment</span> <span class="k">instanceof</span> <span class="n">ConfigurableEnvironment</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">processPropertySource</span><span class="o">(</span><span class="n">propertySource</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">logger</span><span class="o">.</span><span class="na">info</span><span class="o">(</span><span class="s">&#34;Ignoring @PropertySource annotation on [&#34;</span> <span class="o">+</span> <span class="n">sourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">().</span><span class="na">getClassName</span><span class="o">()</span> <span class="o">+</span>
</span></span><span class="line"><span class="cl">						<span class="s">&#34;]. Reason: Environment must implement ConfigurableEnvironment&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line hl"><span class="cl">		<span class="c1">// @ComponentScan，@ComponentScans支持
</span></span></span><span class="line hl"><span class="cl"><span class="c1"></span>		<span class="c1">// Process any @ComponentScan annotations
</span></span></span><span class="line hl"><span class="cl"><span class="c1"></span>		<span class="n">Set</span><span class="o">&lt;</span><span class="n">AnnotationAttributes</span><span class="o">&gt;</span> <span class="n">componentScans</span> <span class="o">=</span> <span class="n">AnnotationConfigUtils</span><span class="o">.</span><span class="na">attributesForRepeatable</span><span class="o">(</span>
</span></span><span class="line hl"><span class="cl">				<span class="n">sourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">(),</span> <span class="n">ComponentScans</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="n">ComponentScan</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
</span></span><span class="line hl"><span class="cl">		<span class="k">if</span> <span class="o">(!</span><span class="n">componentScans</span><span class="o">.</span><span class="na">isEmpty</span><span class="o">()</span> <span class="o">&amp;&amp;</span>
</span></span><span class="line hl"><span class="cl">				<span class="o">!</span><span class="k">this</span><span class="o">.</span><span class="na">conditionEvaluator</span><span class="o">.</span><span class="na">shouldSkip</span><span class="o">(</span><span class="n">sourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">(),</span> <span class="n">ConfigurationPhase</span><span class="o">.</span><span class="na">REGISTER_BEAN</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line hl"><span class="cl">			<span class="k">for</span> <span class="o">(</span><span class="n">AnnotationAttributes</span> <span class="n">componentScan</span> <span class="o">:</span> <span class="n">componentScans</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line hl"><span class="cl">				<span class="c1">// 使用@ComponentScan注释配置类-&gt;立即执行扫描
</span></span></span><span class="line hl"><span class="cl"><span class="c1"></span>				<span class="c1">// The config class is annotated with @ComponentScan -&gt; perform the scan immediately
</span></span></span><span class="line hl"><span class="cl"><span class="c1"></span>				<span class="n">Set</span><span class="o">&lt;</span><span class="n">BeanDefinitionHolder</span><span class="o">&gt;</span> <span class="n">scannedBeanDefinitions</span> <span class="o">=</span>
</span></span><span class="line hl"><span class="cl">						<span class="k">this</span><span class="o">.</span><span class="na">componentScanParser</span><span class="o">.</span><span class="na">parse</span><span class="o">(</span><span class="n">componentScan</span><span class="o">,</span> <span class="n">sourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">().</span><span class="na">getClassName</span><span class="o">());</span>
</span></span><span class="line hl"><span class="cl">				<span class="c1">// Check the set of scanned definitions for any further config classes and parse recursively if needed
</span></span></span><span class="line hl"><span class="cl"><span class="c1"></span>				<span class="k">for</span> <span class="o">(</span><span class="n">BeanDefinitionHolder</span> <span class="n">holder</span> <span class="o">:</span> <span class="n">scannedBeanDefinitions</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line hl"><span class="cl">					<span class="n">BeanDefinition</span> <span class="n">bdCand</span> <span class="o">=</span> <span class="n">holder</span><span class="o">.</span><span class="na">getBeanDefinition</span><span class="o">().</span><span class="na">getOriginatingBeanDefinition</span><span class="o">();</span>
</span></span><span class="line hl"><span class="cl">					<span class="k">if</span> <span class="o">(</span><span class="n">bdCand</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line hl"><span class="cl">						<span class="n">bdCand</span> <span class="o">=</span> <span class="n">holder</span><span class="o">.</span><span class="na">getBeanDefinition</span><span class="o">();</span>
</span></span><span class="line hl"><span class="cl">					<span class="o">}</span>
</span></span><span class="line hl"><span class="cl">					<span class="c1">// TODO 如果是配置类，则递归调用ConfigurationClassParser.parse()
</span></span></span><span class="line hl"><span class="cl"><span class="c1"></span>					<span class="k">if</span> <span class="o">(</span><span class="n">ConfigurationClassUtils</span><span class="o">.</span><span class="na">checkConfigurationClassCandidate</span><span class="o">(</span><span class="n">bdCand</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">metadataReaderFactory</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line hl"><span class="cl">						<span class="n">parse</span><span class="o">(</span><span class="n">bdCand</span><span class="o">.</span><span class="na">getBeanClassName</span><span class="o">(),</span> <span class="n">holder</span><span class="o">.</span><span class="na">getBeanName</span><span class="o">());</span>
</span></span><span class="line hl"><span class="cl">					<span class="o">}</span>
</span></span><span class="line hl"><span class="cl">				<span class="o">}</span>
</span></span><span class="line hl"><span class="cl">			<span class="o">}</span>
</span></span><span class="line hl"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 处理@Import注解导入
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Process any @Import annotations
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">processImports</span><span class="o">(</span><span class="n">configClass</span><span class="o">,</span> <span class="n">sourceClass</span><span class="o">,</span> <span class="n">getImports</span><span class="o">(</span><span class="n">sourceClass</span><span class="o">),</span> <span class="kc">true</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 处理@ImportResource注解导入
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Process any @ImportResource annotations
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">AnnotationAttributes</span> <span class="n">importResource</span> <span class="o">=</span>
</span></span><span class="line"><span class="cl">				<span class="n">AnnotationConfigUtils</span><span class="o">.</span><span class="na">attributesFor</span><span class="o">(</span><span class="n">sourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">(),</span> <span class="n">ImportResource</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">importResource</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">String</span><span class="o">[]</span> <span class="n">resources</span> <span class="o">=</span> <span class="n">importResource</span><span class="o">.</span><span class="na">getStringArray</span><span class="o">(</span><span class="s">&#34;locations&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="n">Class</span><span class="o">&lt;?</span> <span class="kd">extends</span> <span class="n">BeanDefinitionReader</span><span class="o">&gt;</span> <span class="n">readerClass</span> <span class="o">=</span> <span class="n">importResource</span><span class="o">.</span><span class="na">getClass</span><span class="o">(</span><span class="s">&#34;reader&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">resource</span> <span class="o">:</span> <span class="n">resources</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">String</span> <span class="n">resolvedResource</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">environment</span><span class="o">.</span><span class="na">resolveRequiredPlaceholders</span><span class="o">(</span><span class="n">resource</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="n">configClass</span><span class="o">.</span><span class="na">addImportedResource</span><span class="o">(</span><span class="n">resolvedResource</span><span class="o">,</span> <span class="n">readerClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 处理@Bean注解的解析
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Process individual @Bean methods
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">Set</span><span class="o">&lt;</span><span class="n">MethodMetadata</span><span class="o">&gt;</span> <span class="n">beanMethods</span> <span class="o">=</span> <span class="n">retrieveBeanMethodMetadata</span><span class="o">(</span><span class="n">sourceClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">MethodMetadata</span> <span class="n">methodMetadata</span> <span class="o">:</span> <span class="n">beanMethods</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">configClass</span><span class="o">.</span><span class="na">addBeanMethod</span><span class="o">(</span><span class="k">new</span> <span class="n">BeanMethod</span><span class="o">(</span><span class="n">methodMetadata</span><span class="o">,</span> <span class="n">configClass</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 处理接口上的默认方法
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Process default methods on interfaces
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">processInterfaces</span><span class="o">(</span><span class="n">configClass</span><span class="o">,</span> <span class="n">sourceClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// Process superclass, if any
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">sourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">().</span><span class="na">hasSuperClass</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">String</span> <span class="n">superclass</span> <span class="o">=</span> <span class="n">sourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">().</span><span class="na">getSuperClassName</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">superclass</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="n">superclass</span><span class="o">.</span><span class="na">startsWith</span><span class="o">(</span><span class="s">&#34;java&#34;</span><span class="o">)</span> <span class="o">&amp;&amp;</span>
</span></span><span class="line"><span class="cl">					<span class="o">!</span><span class="k">this</span><span class="o">.</span><span class="na">knownSuperclasses</span><span class="o">.</span><span class="na">containsKey</span><span class="o">(</span><span class="n">superclass</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">this</span><span class="o">.</span><span class="na">knownSuperclasses</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">superclass</span><span class="o">,</span> <span class="n">configClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// Superclass found, return its annotation metadata and recurse
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="k">return</span> <span class="n">sourceClass</span><span class="o">.</span><span class="na">getSuperClass</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// No superclass -&gt; processing is complete
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span></span></span></code></pre></td></tr></table>
</div>
</div></p>
<p>以上代码完成了对相关注解的扫描解析。这里着重看一下 ComponentScan 的解析，其他的注解解析，源码中有注释。</p>
<p>ComponentScan的解析，大概分为这么几步：</p>
<ol>
<li>将扫描到的类封装成 BeanDefinitionHolder，放入一个 Set 集合中。（在扫描方法里已经完成了 BeanDefinition 的注册）</li>
<li>调用 checkConfigurationClassCandidate()，这个方法具体怎么检查的，<a href="#checkConfigurationClassCandidate-source" rel="">前面有解释</a> 。</li>
<li>如果 check 的结果为true，说明也是个配置类，递归调用 parse() 方法。</li>
</ol>
<p>关于 componentScanParser.parse() 的源码分析，在 <a href="/posts/spring/02-spring-tag-parse-bean-definition-parser/#22-%e4%b8%bb%e6%b5%81%e7%a8%8b%e6%96%b9%e6%b3%95parse" rel="">Spring标签解析-BeanDefinitionParser</a> 中有说明。</p>
<p>来到 processImports()，看一下是如何处理@Import注解的。首先来到getImports()：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span><span class="lnt">2
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</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">class</span> <span class="nc">ConfigurationClassParser</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="n">Set</span><span class="o">&lt;</span><span class="n">SourceClass</span><span class="o">&gt;</span> <span class="nf">getImports</span><span class="o">(</span><span class="n">SourceClass</span> <span class="n">sourceClass</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">IOException</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">Set</span><span class="o">&lt;</span><span class="n">SourceClass</span><span class="o">&gt;</span> <span class="n">imports</span> <span class="o">=</span> <span class="k">new</span> <span class="n">LinkedHashSet</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="n">Set</span><span class="o">&lt;</span><span class="n">SourceClass</span><span class="o">&gt;</span> <span class="n">visited</span> <span class="o">=</span> <span class="k">new</span> <span class="n">LinkedHashSet</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 收集@import注解。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">collectImports</span><span class="o">(</span><span class="n">sourceClass</span><span class="o">,</span> <span class="n">imports</span><span class="o">,</span> <span class="n">visited</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">imports</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>继续往下跟踪代码：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt"> 1
</span><span class="lnt"> 2
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</span><span class="lnt"> 4
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</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">class</span> <span class="nc">ConfigurationClassParser</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kt">void</span> <span class="nf">collectImports</span><span class="o">(</span><span class="n">SourceClass</span> <span class="n">sourceClass</span><span class="o">,</span> <span class="n">Set</span><span class="o">&lt;</span><span class="n">SourceClass</span><span class="o">&gt;</span> <span class="n">imports</span><span class="o">,</span> <span class="n">Set</span><span class="o">&lt;</span><span class="n">SourceClass</span><span class="o">&gt;</span> <span class="n">visited</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">			<span class="kd">throws</span> <span class="n">IOException</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 获取所有的注解，遍历判断注解是否是@Import，将其搜集起来
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">visited</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="n">sourceClass</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">for</span> <span class="o">(</span><span class="n">SourceClass</span> <span class="n">annotation</span> <span class="o">:</span> <span class="n">sourceClass</span><span class="o">.</span><span class="na">getAnnotations</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">String</span> <span class="n">annName</span> <span class="o">=</span> <span class="n">annotation</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">().</span><span class="na">getClassName</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">				<span class="k">if</span> <span class="o">(!</span><span class="n">annName</span><span class="o">.</span><span class="na">startsWith</span><span class="o">(</span><span class="s">&#34;java&#34;</span><span class="o">)</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="n">annName</span><span class="o">.</span><span class="na">equals</span><span class="o">(</span><span class="n">Import</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">()))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">					<span class="n">collectImports</span><span class="o">(</span><span class="n">annotation</span><span class="o">,</span> <span class="n">imports</span><span class="o">,</span> <span class="n">visited</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="n">imports</span><span class="o">.</span><span class="na">addAll</span><span class="o">(</span><span class="n">sourceClass</span><span class="o">.</span><span class="na">getAnnotationAttributes</span><span class="o">(</span><span class="n">Import</span><span class="o">.</span><span class="na">class</span><span class="o">.</span><span class="na">getName</span><span class="o">(),</span> <span class="s">&#34;value&#34;</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>从上面源码中可以看到，这里获取了所有的注解，然后遍历寻找@Import注解，将其搜集起来。</p>
<p>然后进入 processImports()，会将上面流程中搜集到的@Import注解，作为参数传递进来：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">class</span> <span class="nc">ConfigurationClassParser</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kt">void</span> <span class="nf">processImports</span><span class="o">(</span><span class="n">ConfigurationClass</span> <span class="n">configClass</span><span class="o">,</span> <span class="n">SourceClass</span> <span class="n">currentSourceClass</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">			<span class="n">Collection</span><span class="o">&lt;</span><span class="n">SourceClass</span><span class="o">&gt;</span> <span class="n">importCandidates</span><span class="o">,</span> <span class="kt">boolean</span> <span class="n">checkForCircularImports</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">importCandidates</span><span class="o">.</span><span class="na">isEmpty</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 检测循环导入
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">checkForCircularImports</span> <span class="o">&amp;&amp;</span> <span class="n">isChainedImportOnStack</span><span class="o">(</span><span class="n">configClass</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">problemReporter</span><span class="o">.</span><span class="na">error</span><span class="o">(</span><span class="k">new</span> <span class="n">CircularImportProblem</span><span class="o">(</span><span class="n">configClass</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">importStack</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 这里是一个ArrayDeque
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">this</span><span class="o">.</span><span class="na">importStack</span><span class="o">.</span><span class="na">push</span><span class="o">(</span><span class="n">configClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			
</span></span><span class="line"><span class="cl">            <span class="k">for</span> <span class="o">(</span><span class="n">SourceClass</span> <span class="n">candidate</span> <span class="o">:</span> <span class="n">importCandidates</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                <span class="c1">// 这里会处理ImportSelector类型的。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                <span class="k">if</span> <span class="o">(</span><span class="n">candidate</span><span class="o">.</span><span class="na">isAssignable</span><span class="o">(</span><span class="n">ImportSelector</span><span class="o">.</span><span class="na">class</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                    <span class="c1">// Candidate class is an ImportSelector -&gt; delegate to it to determine imports
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                    <span class="n">Class</span><span class="o">&lt;?&gt;</span> <span class="n">candidateClass</span> <span class="o">=</span> <span class="n">candidate</span><span class="o">.</span><span class="na">loadClass</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">                    <span class="n">ImportSelector</span> <span class="n">selector</span> <span class="o">=</span> <span class="n">BeanUtils</span><span class="o">.</span><span class="na">instantiateClass</span><span class="o">(</span><span class="n">candidateClass</span><span class="o">,</span> <span class="n">ImportSelector</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">                    <span class="n">ParserStrategyUtils</span><span class="o">.</span><span class="na">invokeAwareMethods</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">                            <span class="n">selector</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">environment</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">resourceLoader</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">registry</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">                    <span class="k">if</span> <span class="o">(</span><span class="n">selector</span> <span class="k">instanceof</span> <span class="n">DeferredImportSelector</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                        <span class="k">this</span><span class="o">.</span><span class="na">deferredImportSelectorHandler</span><span class="o">.</span><span class="na">handle</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">                                <span class="n">configClass</span><span class="o">,</span> <span class="o">(</span><span class="n">DeferredImportSelector</span><span class="o">)</span> <span class="n">selector</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">                    <span class="o">}</span>
</span></span><span class="line"><span class="cl">                    <span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                        <span class="c1">// 实例化 ImportSelector 后，会执行selectImports()方法。获取到一个className数组。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                        <span class="c1">// 将其封装为SourceClass，然后递归调用当前方法，最终会走到else语句块中。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                        <span class="n">String</span><span class="o">[]</span> <span class="n">importClassNames</span> <span class="o">=</span> <span class="n">selector</span><span class="o">.</span><span class="na">selectImports</span><span class="o">(</span><span class="n">currentSourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">                        <span class="n">Collection</span><span class="o">&lt;</span><span class="n">SourceClass</span><span class="o">&gt;</span> <span class="n">importSourceClasses</span> <span class="o">=</span> <span class="n">asSourceClasses</span><span class="o">(</span><span class="n">importClassNames</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">                        <span class="n">processImports</span><span class="o">(</span><span class="n">configClass</span><span class="o">,</span> <span class="n">currentSourceClass</span><span class="o">,</span> <span class="n">importSourceClasses</span><span class="o">,</span> <span class="kc">false</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">                    <span class="o">}</span>
</span></span><span class="line"><span class="cl">                <span class="o">}</span>
</span></span><span class="line"><span class="cl">                <span class="c1">// EnableAspectJAutoProxy中导入的AspectJAutoProxyRegistrar就是实现了ImportBeanDefinitionRegistrar
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                <span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="n">candidate</span><span class="o">.</span><span class="na">isAssignable</span><span class="o">(</span><span class="n">ImportBeanDefinitionRegistrar</span><span class="o">.</span><span class="na">class</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                    <span class="c1">// Candidate class is an ImportBeanDefinitionRegistrar -&gt;
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                    <span class="c1">// delegate to it to register additional bean definitions
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                    <span class="n">Class</span><span class="o">&lt;?&gt;</span> <span class="n">candidateClass</span> <span class="o">=</span> <span class="n">candidate</span><span class="o">.</span><span class="na">loadClass</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">                    <span class="n">ImportBeanDefinitionRegistrar</span> <span class="n">registrar</span> <span class="o">=</span>
</span></span><span class="line"><span class="cl">                            <span class="n">BeanUtils</span><span class="o">.</span><span class="na">instantiateClass</span><span class="o">(</span><span class="n">candidateClass</span><span class="o">,</span> <span class="n">ImportBeanDefinitionRegistrar</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">                    <span class="n">ParserStrategyUtils</span><span class="o">.</span><span class="na">invokeAwareMethods</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">                            <span class="n">registrar</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">environment</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">resourceLoader</span><span class="o">,</span> <span class="k">this</span><span class="o">.</span><span class="na">registry</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">                    <span class="n">configClass</span><span class="o">.</span><span class="na">addImportBeanDefinitionRegistrar</span><span class="o">(</span><span class="n">registrar</span><span class="o">,</span> <span class="n">currentSourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">                <span class="o">}</span>
</span></span><span class="line"><span class="cl">                <span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                    <span class="c1">// Candidate class not an ImportSelector or ImportBeanDefinitionRegistrar -&gt;
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                    <span class="c1">// process it as an @Configuration class
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                    <span class="k">this</span><span class="o">.</span><span class="na">importStack</span><span class="o">.</span><span class="na">registerImport</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">                            <span class="n">currentSourceClass</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">(),</span> <span class="n">candidate</span><span class="o">.</span><span class="na">getMetadata</span><span class="o">().</span><span class="na">getClassName</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">                    <span class="n">processConfigurationClass</span><span class="o">(</span><span class="n">candidate</span><span class="o">.</span><span class="na">asConfigClass</span><span class="o">(</span><span class="n">configClass</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">                <span class="o">}</span>
</span></span><span class="line"><span class="cl">            <span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 省略...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>上面代码分为三个分支：</p>
<ul>
<li>遍历所有的importCandidates，判断是否为ImportSelector，如果为true，则执行selectImports()，获取到导入的className数组。然后递归调用，最终会执行到步骤3。</li>
<li>处理ImportBeanDefinitionRegistrar类型的，与步骤1类似，然后直接注册。跳出方法</li>
<li>将 Metadata 存储到 importStack 中，然后递归调用 processConfigurationClass，这也是一个@Configuration类。</li>
</ul>
<h2 id="4-装载beandefinition">4 装载BeanDefinition</h2>
<p>loadBeanDefinitions() 方法参数是一个 ConfigurationClass 的集合，从名字就可以看出，这是一个配置类的集合。</p>
<p>这些配置类是在上面的流程中，扫描包中的类时，扫描到有配置信息的类。</p>
<p>最终会进行以下调用，又会回到 springioc 容器初始化时，解析标签的那段代码。</p>
<p>关键源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">class</span> <span class="nc">ConfigurationClassBeanDefinitionReader</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kd">private</span> <span class="kt">void</span> <span class="nf">loadBeanDefinitionsForConfigurationClass</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">			<span class="n">ConfigurationClass</span> <span class="n">configClass</span><span class="o">,</span> <span class="n">TrackedConditionEvaluator</span> <span class="n">trackedConditionEvaluator</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 省略无关代码...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// @Import注解中，导入的类，包装为BeanDefinition并注册到容器。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">if</span> <span class="o">(</span><span class="n">configClass</span><span class="o">.</span><span class="na">isImported</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">            <span class="n">registerBeanDefinitionForImportedConfigurationClass</span><span class="o">(</span><span class="n">configClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">        <span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// @Bean注解的方法，将对应的metadata包装为BeanDefinition并注册到容器。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="c1">// 这里并没有执行方法，真正执行方法是在实例化的时候。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">for</span> <span class="o">(</span><span class="n">BeanMethod</span> <span class="n">beanMethod</span> <span class="o">:</span> <span class="n">configClass</span><span class="o">.</span><span class="na">getBeanMethods</span><span class="o">())</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">            <span class="n">loadBeanDefinitionsForBeanMethod</span><span class="o">(</span><span class="n">beanMethod</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">        <span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">        <span class="c1">// 加载导入资源
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="n">loadBeanDefinitionsFromImportedResources</span><span class="o">(</span><span class="n">configClass</span><span class="o">.</span><span class="na">getImportedResources</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 这里是加载ImportBeanDefinitionRegistrar接口注册的BeanDefinition，通过调用registerBeanDefinitions()来注入
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="n">loadBeanDefinitionsFromRegistrars</span><span class="o">(</span><span class="n">configClass</span><span class="o">.</span><span class="na">getImportBeanDefinitionRegistrars</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>从源码注释中可以很清楚的看到，loadBeanDefinitions() 都做了那些事情。</p>
<ol>
<li>解析@Import 导入的类，包装为 BeanDefinition 并注册到容器。</li>
<li>解析 @Bean 注解的方法，包装成 BeanDefinition 并注册到容器。</li>
<li>加载导入资源的BeanDefinition，这个是import标签的支持。</li>
<li>调用容器中已注册的 ImportBeanDefinitionRegistrar 实现类的 registerBeanDefinitions()。</li>
</ol>
<div class="details admonition tip open">
        <div class="details-summary admonition-title">
            <i class="icon fas fa-lightbulb fa-fw"></i>技巧<i class="details-icon fas fa-angle-right fa-fw"></i>
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        <div class="details-content">
            <div class="admonition-content">AOP的支持，就是通过 ImportBeanDefinitionRegistrar.registerBeanDefinitions() 注册进来的，其实现类是 AspectJAutoProxyRegistrar。</div>
        </div>
    </div>
<p>调用链流程如下：</p>
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